2C ON THE MOLLUSCAN GEXUS COCHLITOMA. 



does not fall into line in the character of its penis sheath. These 

 two forms also appear to be separate from the other fox-ms in 

 respect of the jaw (v. supra). Conchologically some of the forms 

 included are indistinguishable from Achatina (s.s.). We there- 

 fore conclude that the present conception of the genus Cochlitoma 

 is unsound. Fresh data are, however, necessar}' before a final 

 arranefement of the forms involved can be made. 



Liter atu7^e cited. 



Amaudrut. 1886. — "Systeme nerveux des quelques Mollusques 



pulmones." Bull. Soc. Philomath. Paris, (7) x, 



p. 107. 

 Connolly. 1912. — "Reference list of South African non-marine 



Mollusca.'" Ann. South African Mus. xi. pt. 3, 



p. 59. 

 Deshayes. 1821.— Histoire nat. Moll. Atlas (2) pi. 127. 

 Ferussac. 1821.— Prodromus (Tabl. Syst. Moll.) p. 52. 

 Nabias. 1894. — " Kecherches sur les centres nerveux des Gaste- 



ropodes." Actes Soc. Linn. Bordeaux, (5) xlvii. 



t. 7. p. 11. 

 Pfeifper. 1854. — "Neue Heliceen." Malak. Blatt., Cassel, i. 



p. 224. 

 PiLSBRY. 1904. — Tryon's Manual of Conch ology, Philadelphia, 



(2) 'SNii. passiin. 

 „ 1912. — The same, (2) xxii. p. xxix. 

 „ 1919.— "Land Mollusks of the Belgian Congo." Bull. 



Am. Mus. N". Hist. New York, xl. art. 1, p. 1. 

 Plate. 1896. — " Anatomie des BuUmi(s ovatus, etc." Sitz. Ges. 



Naturf. Freunde, Berlin, p. 232. 

 Semper. 1870. — Reisen . . . Archipel d. Philippinen, Wiesbaden, 



Th. ii. Bd. 3. p. 144. 

 WiEGMANN. 1898. — (v. Martens & Wiegmann), " Mollusken der 



Sejrchellen." Mitth. Zool. Mus. Berlin, i. p. 38. 

 " X " (Cummings & Robson). 1914. — "Taxonomy and Evolution." 



American Naturalist, Ncav York, xlviii. p. 369. 



